How to use the mongodb-core.MongoError function in mongodb-core

throw new MongoError('collection name must be a String');
  }

  if (!collectionName || collectionName.indexOf('..') !== -1) {
    throw new MongoError('collection names cannot be empty');
  }

  if (
    collectionName.indexOf('$') !== -1 &&
    collectionName.match(/((^\$cmd)|(oplog\.\$main))/) == null
  ) {
    throw new MongoError("collection names must not contain '$'");
  }

  if (collectionName.match(/^\.|\.$/) != null) {
    throw new MongoError("collection names must not start or end with '.'");
  }

  // Validate that we are not passing 0x00 in the colletion name
  if (collectionName.indexOf('\x00') !== -1) {
    throw new MongoError('collection names cannot contain a null character');
  }
};

function connectCallback(err, db) {
    if(err && err.message == 'no mongos proxies found in seed list') {
      if(logger.isWarn()) {
        logger.warn(f('seed list contains no mongos proxies, replicaset connections requires the parameter replicaSet to be supplied in the URI or options object, mongodb://server:port/db?replicaSet=name'));
      }

      // Return a more specific error message for MongoClient.connect
      return callback(new MongoError('seed list contains no mongos proxies, replicaset connections requires the parameter replicaSet to be supplied in the URI or options object, mongodb://server:port/db?replicaSet=name'));
    }

    // Return the error and db instance
    callback(err, db);
  }

// Pass to the raw bulk
      bulk.raw(operations[i]);
    }
  } catch(err) {
    return callback(err, null);
  }

  // Final options for write concern
  var finalOptions = writeConcern(shallowClone(options), self.s.db, self, options);
  var writeCon = finalOptions.writeConcern ? finalOptions.writeConcern : {};
  var capabilities = self.s.topology.capabilities();

  // Did the user pass in a collation, check if our write server supports it
  if(collation && capabilities && !capabilities.commandsTakeCollation) {
    return callback(new MongoError(f('server/primary/mongos does not support collation')));
  }

  // Execute the bulk
  bulk.execute(writeCon, function(err, r) {
    // We have connection level error
    if(!r && err) return callback(err, null);
    // We have single error
    if(r && r.hasWriteErrors() && r.getWriteErrorCount() == 1) {
      return callback(toError(r.getWriteErrorAt(0)), r);
    }

    r.insertedCount = r.nInserted;
    r.matchedCount = r.nMatched;
    r.modifiedCount = r.nModified || 0;
    r.deletedCount = r.nRemoved;
    r.upsertedCount = r.getUpsertedIds().length;

}

    // Remove any write concern operations
    var removeKeys = ['w', 'wtimeout', 'j', 'fsync', 'readPreference'];
    for(var i = 0; i < removeKeys.length; i++) {
      delete indexes[0][removeKeys[i]];
    }
  }

  // Get capabilities
  var capabilities = self.s.topology.capabilities();

  // Did the user pass in a collation, check if our write server supports it
  if(indexes[0].collation && capabilities && !capabilities.commandsTakeCollation) {
    // Create a new error
    var error = new MongoError(f('server/primary/mongos does not support collation'));
    error.code = 67;
    // Return the error
    return callback(error);
  }

  // Create command, apply write concern to command
  var cmd = writeConcern({createIndexes: name, indexes: indexes}, self, options);

  // Decorate command with writeConcern if supported
  decorateWithWriteConcern(cmd, self, options);

  // ReadPreference primary
  options.readPreference = ReadPreference.PRIMARY;

  // Build the command
  self.command(cmd, options, function(err, result) {

if (callback) callback(null, collection);
      return collection;
    } catch (err) {
      if (err instanceof MongoError && callback) return callback(err);
      throw err;
    }
  }

  // Strict mode
  if (typeof callback !== 'function') {
    throw toError(`A callback is required in strict mode. While getting collection ${name}`);
  }

  // Did the user destroy the topology
  if (this.serverConfig && this.serverConfig.isDestroyed()) {
    return callback(new MongoError('topology was destroyed'));
  }

  const listCollectionOptions = Object.assign({}, options, { nameOnly: true });

  // Strict mode
  this.listCollections({ name: name }, listCollectionOptions).toArray((err, collections) => {
    if (err != null) return handleCallback(callback, err, null);
    if (collections.length === 0)
      return handleCallback(
        callback,
        toError(`Collection ${name} does not exist. Currently in strict mode.`),
        null
      );

    try {
      return handleCallback(

Collection.prototype.listIndexes = function(options) {
  options = options || {};
  // Clone the options
  options = shallowClone(options);
  // Set the CommandCursor constructor
  options.cursorFactory = CommandCursor;
  // Set the promiseLibrary
  options.promiseLibrary = this.s.promiseLibrary;

  if(!this.s.topology.capabilities()) {
    throw new MongoError('cannot connect to server');
  }

  // We have a list collections command
  if(this.s.topology.capabilities().hasListIndexesCommand) {
    // Cursor options
    var cursor = options.batchSize ? {batchSize: options.batchSize} : {}
    // Build the command
    var command = { listIndexes: this.s.name, cursor: cursor };
    // Execute the cursor
    var cursor = this.s.topology.cursor(f('%s.$cmd', this.s.dbName), command, options);
    // Do we have a readPreference, apply it
    if(options.readPreference) cursor.setReadPreference(options.readPreference);
    // Return the cursor
    return cursor;
  }

var checkCollectionName = function checkCollectionName (collectionName) {
  if('string' !== typeof collectionName) {
    throw new MongoError("collection name must be a String");
  }

  if(!collectionName || collectionName.indexOf('..') != -1) {
    throw new MongoError("collection names cannot be empty");
  }

  if(collectionName.indexOf('$') != -1 &&
      collectionName.match(/((^\$cmd)|(oplog\.\$main))/) == null) {
    throw new MongoError("collection names must not contain '$'");
  }

  if(collectionName.match(/^\.|\.$/) != null) {
    throw new MongoError("collection names must not start or end with '.'");
  }

  // Validate that we are not passing 0x00 in the collection name
  if(!!~collectionName.indexOf("\x00")) {
    throw new MongoError("collection names cannot contain a null character");
  }
};

Cursor.prototype.toArray = function(callback) {
  var self = this;
  if(!callback) throw new MongoError('callback is mandatory');
  if(self.s.options.tailable) return handleCallback(callback, new MongoError("Tailable cursor cannot be converted to array"), null);
  var items = [];

  // Reset cursor
  this.rewind();
  self.s.state = Cursor.INIT;

  // Fetch all the documents
  var fetchDocs = function() {
    self.next(function(err, doc) {
      if(err) return handleCallback(callback, err);
      if(doc == null) {
        self.s.state = Cursor.CLOSED;
        return handleCallback(callback, null, items);
      }

      // Add doc to items

function validOptions(options) {
  var _validOptions = validOptionNames.concat(legacyOptionNames);

  for(var name in options) {
    if(ignoreOptionNames.indexOf(name) != -1) {
      continue;
    }

    if(_validOptions.indexOf(name) == -1 && options.validateOptions) {
      return new MongoError(f('option %s is not supported', name));
    } else if(_validOptions.indexOf(name) == -1) {
      console.warn(f('the options [%s] is not supported', name));
    }

    if(legacyOptionNames.indexOf(name) != -1) {
      console.warn(f('the server/replset/mongos options are deprecated, '
      + 'all their options are supported at the top level of the options object [%s]', validOptionNames));
    }
  }
}

order = new Map(order.map(function(x) {
      var value = [x[0], null];
      if(x[1] == 'asc') {
        value[1] = 1;
      } else if(x[1] == 'desc') {
        value[1] = -1;
      } else if(x[1] == 1 || x[1] == -1) {
        value[1] = x[1];
      } else {
        throw new MongoError("Illegal sort clause, must be of the form [['field1', '(ascending|descending)'], ['field2', '(ascending|descending)']]");
      }

      return value;
    }));
  }